This is where all the related code already lives. Signed-off-by: Christoph Hellwig <hch@xxxxxx> --- drivers/base/Kconfig | 77 -------------------------------------------- kernel/dma/Kconfig | 77 ++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 77 insertions(+), 77 deletions(-) diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig index 3e63a900b330..059700ea3521 100644 --- a/drivers/base/Kconfig +++ b/drivers/base/Kconfig @@ -191,83 +191,6 @@ config DMA_FENCE_TRACE lockup related problems for dma-buffers shared across multiple devices. -config DMA_CMA - bool "DMA Contiguous Memory Allocator" - depends on HAVE_DMA_CONTIGUOUS && CMA - help - This enables the Contiguous Memory Allocator which allows drivers - to allocate big physically-contiguous blocks of memory for use with - hardware components that do not support I/O map nor scatter-gather. - - You can disable CMA by specifying "cma=0" on the kernel's command - line. - - For more information see <include/linux/dma-contiguous.h>. - If unsure, say "n". - -if DMA_CMA -comment "Default contiguous memory area size:" - -config CMA_SIZE_MBYTES - int "Size in Mega Bytes" - depends on !CMA_SIZE_SEL_PERCENTAGE - default 0 if X86 - default 16 - help - Defines the size (in MiB) of the default memory area for Contiguous - Memory Allocator. If the size of 0 is selected, CMA is disabled by - default, but it can be enabled by passing cma=size[MG] to the kernel. - - -config CMA_SIZE_PERCENTAGE - int "Percentage of total memory" - depends on !CMA_SIZE_SEL_MBYTES - default 0 if X86 - default 10 - help - Defines the size of the default memory area for Contiguous Memory - Allocator as a percentage of the total memory in the system. - If 0 percent is selected, CMA is disabled by default, but it can be - enabled by passing cma=size[MG] to the kernel. - -choice - prompt "Selected region size" - default CMA_SIZE_SEL_MBYTES - -config CMA_SIZE_SEL_MBYTES - bool "Use mega bytes value only" - -config CMA_SIZE_SEL_PERCENTAGE - bool "Use percentage value only" - -config CMA_SIZE_SEL_MIN - bool "Use lower value (minimum)" - -config CMA_SIZE_SEL_MAX - bool "Use higher value (maximum)" - -endchoice - -config CMA_ALIGNMENT - int "Maximum PAGE_SIZE order of alignment for contiguous buffers" - range 4 12 - default 8 - help - DMA mapping framework by default aligns all buffers to the smallest - PAGE_SIZE order which is greater than or equal to the requested buffer - size. This works well for buffers up to a few hundreds kilobytes, but - for larger buffers it just a memory waste. With this parameter you can - specify the maximum PAGE_SIZE order for contiguous buffers. Larger - buffers will be aligned only to this specified order. The order is - expressed as a power of two multiplied by the PAGE_SIZE. - - For example, if your system defaults to 4KiB pages, the order value - of 8 means that the buffers will be aligned up to 1MiB only. - - If unsure, leave the default value "8". - -endif - config GENERIC_ARCH_TOPOLOGY bool help diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig index b122ab100d66..d785286ad868 100644 --- a/kernel/dma/Kconfig +++ b/kernel/dma/Kconfig @@ -53,3 +53,80 @@ config DMA_REMAP config DMA_DIRECT_REMAP bool select DMA_REMAP + +config DMA_CMA + bool "DMA Contiguous Memory Allocator" + depends on HAVE_DMA_CONTIGUOUS && CMA + help + This enables the Contiguous Memory Allocator which allows drivers + to allocate big physically-contiguous blocks of memory for use with + hardware components that do not support I/O map nor scatter-gather. + + You can disable CMA by specifying "cma=0" on the kernel's command + line. + + For more information see <include/linux/dma-contiguous.h>. + If unsure, say "n". + +if DMA_CMA +comment "Default contiguous memory area size:" + +config CMA_SIZE_MBYTES + int "Size in Mega Bytes" + depends on !CMA_SIZE_SEL_PERCENTAGE + default 0 if X86 + default 16 + help + Defines the size (in MiB) of the default memory area for Contiguous + Memory Allocator. If the size of 0 is selected, CMA is disabled by + default, but it can be enabled by passing cma=size[MG] to the kernel. + + +config CMA_SIZE_PERCENTAGE + int "Percentage of total memory" + depends on !CMA_SIZE_SEL_MBYTES + default 0 if X86 + default 10 + help + Defines the size of the default memory area for Contiguous Memory + Allocator as a percentage of the total memory in the system. + If 0 percent is selected, CMA is disabled by default, but it can be + enabled by passing cma=size[MG] to the kernel. + +choice + prompt "Selected region size" + default CMA_SIZE_SEL_MBYTES + +config CMA_SIZE_SEL_MBYTES + bool "Use mega bytes value only" + +config CMA_SIZE_SEL_PERCENTAGE + bool "Use percentage value only" + +config CMA_SIZE_SEL_MIN + bool "Use lower value (minimum)" + +config CMA_SIZE_SEL_MAX + bool "Use higher value (maximum)" + +endchoice + +config CMA_ALIGNMENT + int "Maximum PAGE_SIZE order of alignment for contiguous buffers" + range 4 12 + default 8 + help + DMA mapping framework by default aligns all buffers to the smallest + PAGE_SIZE order which is greater than or equal to the requested buffer + size. This works well for buffers up to a few hundreds kilobytes, but + for larger buffers it just a memory waste. With this parameter you can + specify the maximum PAGE_SIZE order for contiguous buffers. Larger + buffers will be aligned only to this specified order. The order is + expressed as a power of two multiplied by the PAGE_SIZE. + + For example, if your system defaults to 4KiB pages, the order value + of 8 means that the buffers will be aligned up to 1MiB only. + + If unsure, leave the default value "8". + +endif -- 2.20.1
